Display device

ABSTRACT

Disclosed is a display device. The display device achieves a slim bezel by forming a through hole at a bottom portion of a cover, and changing a connection structure of a sub-FPCB to be connected to a main FPCB such that the connection structure extends through the cover without extending along the outside of the cover. The display device achieves a reduction in the thickness of the display device and an enhancement in picture quality through change of an installation direction of an LED module constituted by a main FPCB and LED elements disposed at one surface of the main FPCB. The display device can reduce a space where a sensor unit is disposed in conventional cases by mounting the sensor unit on the LED module, and can realize an additional function such as skin care or sterilization in accordance with the kind of the sensor unit.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a divisional application of U.S. Patent ApplicationNo. 16/545,450, filed on Aug. 20, 2019; which claims the benefit ofKorean Patent Application No. 10-2018-0107130, filed on Sep. 7, 2018,which is hereby incorporated by reference as if fully set forth herein.

BACKGROUND Technical Field

The present disclosure relates to a display device capable of achievingan enhancement in image quality and a reduction in bezel size throughchange of an installation direction of a light emitting diode (LED)module or an improved connection structure of the LED module.

Description of the Related Art

Recently, in information-dependent society, displays (or displaydevices) have been highly important as a visual information transfermedium. Such displays should satisfy demand for low power consumption,thinness, lightness, high picture quality, etc., in order to hold animportant position in future.

Displays may be classified into emissive displays, which emit light bythemselves, for example, a cathode ray tube (CRT), an electroluminescent(EL) display, an LED display, a vacuum fluorescent display (VFD), afield emission display (FED) and a plasma display panel (PDP) andnon-emissive displays, which cannot emit light by themselves, forexample, a liquid crystal display (LCD).

Among various displays as mentioned above, the LCD, which expresses animage using an optical anisotropic property of liquid crystals, ishighlighted as a display device because the LCD exhibits superiorvisibility, as compared to existing CRTs, while exhibiting low averagepower consumption and low heat generation, as compared to CRTs havingthe same screen size as the LCD.

Such an LCD is a display device in which a light source is disposedbeneath liquid crystals, and an image is expressed by adjustingtransmittance of light generated from the light source through controlof alignment of the liquid crystals by application of an electric fieldto the liquid crystals. The LCD is applied to various electronicequipment such as a smartphone and a tablet personal computer (PC). Inparticular, in the LCD, a liquid crystal panel is disposed beneath acover glass, and a backlight unit is disposed beneath the liquid crystalpanel. The LCD also includes a guide panel for accommodating the liquidcrystal panel or the backlight unit therein, and a cover bottom disposedoutside the guide panel and coupled to the guide panel.

In connection with such an LCD, however, there is continuously increaseddemand for lightness and thinness in accordance with current consumertrends. Furthermore, there is demand for a structure having a thin bezelor no bezel.

BRIEF SUMMARY

Accordingly, the present disclosure is directed to a display device thatsubstantially obviates one or more problems due to limitations anddisadvantages of the related art.

An object of the present disclosure is to provide a display devicecapable of embodying a thinner bezel through a changed shape of a coverand an improved connection structure of a light emitting diode (LED)module.

Another object of the present disclosure is to provide a display devicecapable of achieving a reduction in thickness while achieving anenhancement in picture quality through change of an installationdirection of an LED module.

Another object of the present disclosure is to provide a display devicecapable of reducing a space where a sensor unit is disposed inconventional cases by mounting the sensor unit on an LED module, andrealizing an additional function such as skin care or sterilization inaccordance with the kind of the sensor unit.

Additional advantages, objects, and features of the disclosure will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of thedisclosure. The objectives and other advantages of the disclosure may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the disclosure, as embodied and broadly described herein, adisplay device achieves a slim bezel by forming a through hole at aportion of a cover, and changing a connection structure of asub-flexible printed circuit board (FPCB) to be connected to a main FPCBsuch that the connection structure extends through the cover withoutextending along the outside of the cover.

In another aspect of the present disclosure, a display device achieves areduction in the thickness of the entirety of the display device and anenhancement in picture quality through change of an installationdirection of a light emitting diode (LED) module constituted by a mainFPCB and a plurality of LED elements disposed at one surface of the mainFPCB.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure areexemplary and explanatory and are intended to provide furtherexplanation of the disclosure as claimed.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the disclosure andalong with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 is a sectional view illustrating a display device according to afirst embodiment of the present invention;

FIGS. 2 and 3 are sectional views respectively illustrating otherembodiments of the display device illustrated in FIG. 1;

FIG. 4 is a sectional view illustrating a display device according to asecond embodiment of the present invention;

FIG. 5A is a reference view illustrating a picture quality without useof the teaching of the disclosure in which a mura is present;

FIG. 5B is a reference view illustrating a picture quality at a portionof the display device illustrated in FIG. 4;

FIGS. 6 to 8 are sectional views respectively illustrating otherembodiments of the display device illustrated in FIG. 4;

FIG. 9 is a sectional view illustrating a display device according to athird embodiment of the present invention; and

FIG. 10 is a reference view illustrating a portion of an LED module inthe display device of FIG. 9 in an enlarged state.

DETAILED DESCRIPTION

Hereinafter, preferred embodiments of the present disclosure will bedescribed in detail with reference to the accompanying drawings and, assuch, may be easily implemented by one of ordinary skill in the art towhich the present disclosure pertains. Wherever possible, the samereference numbers will be used throughout the drawings to refer to thesame or like parts. In the following description of the presentdisclosure, a detailed description of known functions and configurationsincorporated herein will be omitted when it may obscure the subjectmatter of the present disclosure. Some features shown in the drawingsmay be enlarged, reduced or simplified for convenience of description.The drawings and constituent elements shown therein may not have anappropriate scale. Of course, such detailed matters will be readilyappreciated by those skilled in the art.

FIG. 1 is a sectional view illustrating a display device according to afirst embodiment of the present disclosure. FIGS. 2 and 3 are sectionalviews respectively illustrating other embodiments of the display deviceillustrated in FIG. 1.

Referring to FIGS. 1 to 3, the display device of the present disclosure,which is designated by reference numeral “100,” includes a main flexibleprinted circuit board (FPCB) 112 provided with a plurality of lightemitting diode (LED) elements, a sub-FPCB 113, and a cover bottom 120.The cover bottom 120 is a part or, in some instances, all of the cover.Here, the LED elements 111, the main FPCB 112 and the sub-FPCB 113constitute a backlight unit 10. The main FPCB 112 is a first FPCB andthe sub-FPCB is a second FPCB. In many embodiments, the second FPCB willbe coupled to the main, or first FPCB. A liquid crystal panel (notshown) for rendering an image is disposed over the backlight unit 10.The cover bottom 120 is disposed beneath the backlight unit 10 in orderto cover the backlight unit 10.

At the liquid crystal panel, pixels are arranged in a matrix, to outputan image. The liquid crystal panel includes a color filter substrate andan array substrate, which are assembled to face each other such that auniform cell gap is maintained between the color filter substrate andthe array substrate. The liquid crystal panel also includes a liquidcrystal layer formed in the cell gap between the color filter substrateand the array substrate. Of course, a common electrode and pixelelectrodes are formed at the liquid crystal panel, which includes anassembly of the color filter substrate and the array substrate, to applyan electric field to the liquid crystal layer. When voltages of datasignals to be applied to respective pixel electrodes under the conditionthat a voltage is applied to the common electrode, liquid crystals ofthe liquid crystal layer are rotated due to dielectric anisotropythereof exhibited due to an electric field generated between the commonelectrode and each pixel electrode, thereby allowing or preventingpassage of light through the liquid crystal layer on a per pixel basis.As such, an image or characters are displayed.

In this case, switching elements such as thin film transistors (TFTs)are provided at respective pixels in order to control voltages of datasignals applied to respective pixel electrodes on a per pixel basis.

That is, gate lines and data lines are formed at the array substratesuch that the gate lines and the data lines are arranged in vertical andhorizontal directions, to define pixel areas. TFTs, which are switchingelements, are formed at intersection areas of the gate lines and thedata lines on the array substrate, respectively.

Each TFT includes a gate electrode connected to a corresponding one ofthe gate lines, a source electrode connected to a corresponding one ofthe data lines, and a drain electrode connected to a corresponding oneof the pixel electrodes.

The color filter substrate may include a color filter constituted by aplurality of sub-color filters for rendering red, green and blue (RGB)colors, a black matrix for dividing the sub-color filters from oneanother and blocking light passing through the liquid crystal layer, andan overcoat layer formed over the color filter and the black matrix.

Polarization plates are attached to outer surfaces of the color filtersubstrate and the array substrate, respectively. In this case, a lowerone of the polarization plates polarizes light emerging from thebacklight unit 10 in a direction toward the array substrate, and anupper one of the polarization plates polarizes light emerging from theliquid crystal panel.

A guide panel may be provided at an edge of the backlight unit 10beneath the liquid crystal panel. The guide panel supports the liquidcrystal panel disposed thereover. The guide panel is accommodated in thecover bottom 120, together with the backlight unit 10 which is disposedwithin the guide panel.

Meanwhile, when the LED module 110 is of an edge type, the backlightunit 10 may include a light guide plate disposed beneath the liquidcrystal panel, and a reflective plate disposed at a lower surface of thelight guide plate. The following description will be given inconjunction with an example in which the LED module 110 is of a directtype lighting of an LCD display panel.

As described above, the LED module 110 includes the plurality of LEDelements 111, each of which is a light source for generating light, themain FPCB 112, on which the LED elements 111 are arranged in apredetermined pattern, and the sub-FPCB 113, which is connected to themain FPCB 112.

A plurality of optical sheets (not shown) may be disposed over thebacklight module 10 in order to enhance luminous efficacy of lightemitted from the light sources and, as such, light having enhancedluminous efficacy is emitted to the liquid crystal panel.

The LED module 110 is attached to an inner upper surface of the coverbottom 120 by an adhesive layer 114. In this case, a connector 115 to beconnected to the sub-FPCB 113 is provided at a lower surface of the mainFPCB 112. The sub-FPCB 113 is connected to an external of the displaydevice through a through hole 121 formed at the cover bottom 120 afterbeing connected to the connector 115 at the lower surface of the mainFPCB 112.

The through hole 121 formed at the cover bottom 120 is disposed at anarea where a lower surface of the LED module 110 is attached to thecover bottom 120. Plural sub-FPCBs 113 may be connected to the externalof the display device through plural through holes 121, respectively.

FIG. 2 illustrates an inverted state of a direct type LED module 110 a.In the case of FIG. 2, a plurality of LED elements 111 is disposed on amain FPCB 112 to face the inner upper surface of the cover bottom 120.In this case, the through hole 121 formed at the cover bottom 120 isdisposed at an edge area of the cover bottom 120 in order to enable asub-FPCB 113 to be connected to an edge portion of the LED module 110 a.In this case, the LED elements 111 are disposed at one surface of themain FPCB 112. A connector 115 is disposed at the other surface of themain FPCB 112, and is connected to the sub-FPCB 113.

In the case of FIG. 3, a plurality of LED elements 111 is disposed atone surface of a main FPCB 112. A connector 115 is disposed at an edgeportion of the surface of the main FPCB 112 where the LED elements 111are not disposed. The connector 115 is connected to a sub-FPCB 113.

When the main FPCB 112 and the sub-FPCB 113 in each case are connectedthrough an inner area of the cover bottom 120, as described above, theremay be an effect capable of easily embodying a slim bezel because of areduction in non-display area (NA), as compared to a structure in whicha connection structure of FPCBs surrounds an outer area of the coverbottom 120.

The inverted structure of the LED module not described in conjunctionwith FIGS. 2 and 3 will be described later in detail.

FIG. 4 is a sectional view illustrating a display device according to asecond embodiment of the present disclosure.

FIG. 5A is a reference view illustrating a picture quality without useof the teaching of the disclosure in which a mura is present.

FIG. 5B is a view of at a portion of the display device illustrated inFIG. 4 with the teaching of this disclosure being present.

Referring to FIG. 4, the display device according to the secondembodiment of the present disclosure, which is designated by referencenumeral “200,” includes an LED module 210, a cover bottom 220, anoptical sheet 230, and a guide panel 240.

The LED module 210 includes a plurality of LED elements 211, and a mainFPCB 212 on which the LED elements 211 are arranged in a direct typepattern. The plural LED elements 211 are disposed at one surface of theLED module 210, and the optical sheet 230 is disposed at the othersurface of the LED module 210. In this case, the light emissiondirection of the LED elements 211 is directed to an inner upper surfaceof the cover bottom 220 and, as such, light emitted from the

LED elements 211 travels toward the optical sheet 230 after beingreflected from the upper surface of the cover bottom 220. Of course, themain FPCB 212 is made of a transparent material in order to allow easypassage of light therethrough.

As shown, a liquid crystal display (LCD) panel 241 is disposed over theguide panel 240. The LCD panel 241 is present at a correspondinglocation in the other structures, but it is not shown in the figures forease of illustration.

The optical sheet 230 may include at least one of a diffusion sheet, aprism sheet, a brightness enforcement film such as a dual brightnessenforcement film (DBEF) and a protective film.

When the LED module 210 has an inverted structure, as described above,the path of light travelling from each LED element 211 toward theoptical sheet 230 is lengthened and, as such, it may be possible toeasily induce light diffusion. In addition, it may be possible to reducean optical length d (FIG. 4) between the inner upper surface of thecover bottom 220 and an upper surface of the optical sheet 230 disposedat an uppermost position and, as such, there may be an effect of areduction in the thickness of the display device 200.

In other words, although a certain optical length should be secured inconventional cases in order to avoid a phenomenon that lattice mura isgenerated, as shown in FIG. 5A, such a lattice mura problem may besolved in the embodiment of the present disclosure, as shown in FIG. 5B,because light reflected from the inner upper surface of the cover bottom220 is again directed to the optical sheet 230 in accordance with theinverted arrangement of the LED modules 210.

Furthermore, when the optical length d is reduced, lattice patterns maybe visible due to the insufficient optical length. In this case, theremay be a problem in that it is difficult to reduce the pitch of the LEDelements. However, when the LED module has an inverted structure, it maybe possible to secure an optical length d similar to that ofconventional structures while reducing the thickness of the entirety ofthe display device. In this regard, it may be possible to solve theabove-described problem.

Although not shown, the inner upper surface of the cover bottom 220 maybe subjected to precise machining for formation of a mirror surface (notshown) in order to enhance reflectance of light emitted from the LEDmodule 210.

FIGS. 6 to 8 are sectional views respectively illustrating otherembodiments of the display device illustrated in FIG. 4.

Referring to FIG. 6, the cover bottom 220 in the display deviceaccording to the second embodiment of the present disclosure includesfirst diffusion patterns 221 provided at the inner upper surface of thecover bottom 220.

The first diffusion patterns 221 may be formed integrally with the innerupper surface of the cover bottom 220. The first diffusion patterns 221have a shape protruding from the inner upper surface of the cover bottom220 toward the LED module 210.

The first diffusion patterns 221 have an effect capable of scattering,in various direction, light from the LED elements 211 travelling towardthe inner upper surface of the cover bottom 220 and, as such, diffusionof light reflected from the cover bottom 220 may be enhanced.

FIG. 6 illustrates the first diffusion patterns 221 provided at theinner upper surface of the cover bottom 220 as having a regularsemicircular cross-sectional structure. However, the first diffusionpatterns 221 may be arranged to have irregular pitches or may have across-sectional structure having an oval shape, a polygonal shape havingsides equal to or more than a triangular shape, a tooth shape or thelike. In addition, the first diffusion patterns 221 may have a recessedstructure without protruding from the inner upper surface of the coverbottom 220.

Referring to FIG. 7, a reflective plate 222 is provided at the innerupper surface of the cover bottom 220. The reflective plate 222completely reflects light emitted from the LED elements 211 toward theoptical sheet 230 (FIG. 4) and, as such, it may be possible to increasethe pitch of the LED elements 211. In addition, this structure may beapplied to a display device requiring high brightness.

Although not shown, the reflective plate 222 may be disposed only at aportion of the cover bottom 220, for example, a region between adjacentones of the LED elements 211, in order to avoid lattice mura.

Referring to FIG. 8, second diffusion patterns 223 is provided at theinner upper surface of the cover bottom 220, together with thereflective plate 222. In this case, the function of the reflective plate222 is identical to that of FIG. 7 and, as such, no description thereofwill be given. The second diffusion patterns 223 may have the samestructure as the first diffusion patterns 221.

However, the second diffusion patterns 223 provide a function similar tothat of a diffuser sheet. The second diffusion patterns 223 are formedon the reflective plate 222, using a coating process or sheets type.Accordingly, the second diffusion patterns 223 have a thickness smallerthan that of the first diffusion patterns 221 and, as such, there is anadvantage in that the optical length does not increase. The seconddiffusion pattern 223 may be formed through coating of fine beads in ablack coating manner and, as such, may be applied as an “anti-glare”layer.

FIG. 9 is a sectional view illustrating a display device according to athird embodiment of the present disclosure. FIG. 10 is a reference viewillustrating a portion of an LED module in the display device of FIG. 9in an enlarged state.

Referring to FIGS. 9 and 10, the display device according to the thirdembodiment of the present disclosure, which is designated by referencenumeral “300,” includes an LED module 310, a cover bottom 320, anoptical sheet 330, and sensor units 340.

The LED module 310 includes a plurality of LED elements 311, and a mainFPCB 312 to which the LED elements 311 are coupled.

The optical sheet 330 is disposed over the LED module 310, and the coverbottom 320 is disposed beneath the LED module 310 such that the LEDmodule 310 and the optical sheet 330 are accommodated in the coverbottom 320.

In this case, the sensor units 340 are disposed on the main FPCB 312.Each sensor unit 340 is disposed between adjacent ones of the plural LEDelements 311.

Each sensor unit 340 includes at least one of a proximity sensor, anillumination sensor, a fingerprint sensor, a near infrared (N-IR) chip,and an ultraviolet (UV) chip.

In the case of a portable terminal, a proximity sensor and anillumination sensor are disposed over a front surface of the portableterminal and, as such, it is necessary to provide a non-display areamainly for the proximity sensors and the illumination sensors. However,when the sensor units 340 are disposed between adjacent ones of the LEDmodules 310, it may be possible to reduce a non-display area and, assuch, there may be an advantage in that a slim bezel structure or abezelless structure may be embodied. In association with a fingerprintsensor, fingerprint recognition is possible only at a predeterminedposition through use of a physical button in conventional cases.However, when fingerprint sensors are disposed between adjacent ones ofthe LED modules 310, there may an effect capable of easily recognizing afingerprint at any portion of a display area AA.

The N-IR chip provides a skin care function such as skin whitening,removal of dead skin cells, suppression of sebum secretion, and areduction in the size of skin pores, using near infrared light. The N-IRchip stimulates epidermis and dermis using red-based LED light having awavelength of about 600 to 700 nm or UV LED light having a wavelength ofabout 800 to 980 nm and, as such, provides an effect enabling skin toinduce self-healing when stimulated.

In addition, the UV chip provides sterilization effects using UV light.For example, the user may easily sterilize an area to be sterilized,using a portable terminal provided with the UV chip. Furthermore, inthis case, there may be an advantage in which the portable terminal maybe used in a relatively clean state.

The display device of the present disclosure as described above may havethe following effects.

First, in accordance with the display device of the present disclosure,the sub-FPCB connected to the main FPCB may be connected to the externalof the display device through a through hole formed at the cover bottomand, as such, it may be possible to embody a slim bezel.

Second, the installation direction of the LED module, which isconstituted by a plurality of LED elements, is inverted such that lightemitted from the LED elements is directed to the upper surface of thecover bottom and, as such, it may be possible to reduce a minimumthickness of the backlight unit required for a desired picture quality.

Third, it may be possible to enhance a picture quality while reducingthe thickness of the backlight unit.

Fourth, sensors such as an illumination sensor, a proximity sensor, anda fingerprint sensor are disposed between adjacent ones of the LEDelements. In a portable terminal, accordingly, it may be possible toreduce the space where such sensors are disposed in conventional cases.

Fifth, when a sensor such as an N-IR chip or a UV chip is provided,there may be an effect of skin care using near infrared light or aneffect of sterilization using ultraviolet light.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosure. Thus, itis intended that the present disclosure cover the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents.

The various embodiments described above can be combined to providefurther embodiments. All of the U.S. patents, U.S. patent applicationpublications, U.S. patent applications, foreign patents, foreign patentapplications and non-patent publications referred to in thisspecification and/or listed in the Application Data Sheet areincorporated herein by reference, in their entirety. Aspects of theembodiments can be modified, if necessary to employ concepts of thevarious patents, applications and publications to provide yet furtherembodiments.

These and other changes can be made to the embodiments in light of theabove-detailed description. In general, in the following claims, theterms used should not be construed to limit the claims to the specificembodiments disclosed in the specification and the claims, but should beconstrued to include all possible embodiments along with the full scopeof equivalents to which such claims are entitled. Accordingly, theclaims are not limited by the disclosure.

1. A display device, comprising: a first flexible printed circuit board(FPCB) having a first surface and a second surface opposite the firstsurface; a plurality of light emitting elements disposed on the firstsurface of the first FPCB; a connector on the first FPCB, the connectorelectrically connected to at least one of the plurality of lightemitting elements; a second FPCB electrically connected to the firstFPCB via the connector; and a cover having a first surface and a secondsurface opposite the first surface, the first surface of the coverfacing the first surface of the first FPCB; and a through hole extendingbetween the first surface of the cover and the second surface of thecover.
 2. The display device according to claim 1, wherein the connectoris disposed on the second surface of the first FPCB and the second FPCBextends from the second surface of the first FPCB to the second surfaceof the cover through the through hole.
 3. The display device accordingto claim 1, wherein the connector is disposed on the first surface ofthe first FPCB and the second FPCB extends from the first surface of thefirst FPCB to the second surface of the cover through the through hole.4. The display device according to claim 1, wherein the light emittingelements, in operation, emits light toward a light emission directionfacing the first surface of the cover.
 5. The display device accordingto claim 1, wherein, the connector is disposed at an edge portion of thefirst FPCB.
 6. The display device according to claim 5, wherein thecover further comprises a lateral portion surrounds the first FPCB andthe cover the lateral portion is outside of the edge portion of thefirst FPCB.
 7. The display device according to claim 5, wherein, theedge portion where the connector is disposed does not overlap with anyof the light emitting elements disposed on the first surface of thefirst FPCB.
 8. The display device according to claim 1, wherein thecover comprises first diffusion patterns protruding from first surfaceof the cover in corresponding regions where the light emitting elementsare disposed on the first surface of the FPCB, respectively, the firstdiffusion patterns being integrated with the cover.
 9. The displaydevice according to claim 1, comprising: a reflective plate interposedbetween the cover and the light emitting elements.
 10. The displaydevice according to claim 9, comprising: second diffusion patternsinterposed between the reflective plate and the light emitting elements.11. The display device according to claim 1, comprising: an opticalsheet mounted to the cover, to diffuse light emitted from the lightemitting elements.
 12. The display device according to claim 1,comprising: sensor units each disposed at the first surface of the firstFPCB between adjacent ones of the light emitting elements.
 13. Thedisplay device according to claim 12, wherein each of the sensor unitscomprises at least one of a proximity sensor, an illumination sensor, afingerprint sensor, a near infrared (N-IR) chip, and an ultraviolet (UV)chip.
 14. The display device according to claim 1, wherein a diameter ofthe through hole overlaps with an edge portion of the first FPCB.
 15. Adisplay device, comprising: a first flexible printed circuit board(FPCB) having a first surface and a second surface opposite the firstsurface; a plurality of light emitting elements disposed on the firstsurface of the first FPCB; a connector on the second surface of thefirst FPCB, the connector electrically connected to at least one of theplurality of light emitting elements; a second FPCB electricallyconnected to the first FPCB via the connector; a cover having a firstsurface and a second surface opposite the first surface, the firstsurface of the cover facing the first surface of the first FPCB, thecover at least partially surrounds the first FPCB; and a through holeextending between the first surface of the cover and the second surfaceof the cover.
 16. The display device according to claim 14, comprising:sensor units each disposed at the first surface of the first FPCBbetween adjacent ones of the light emitting elements, each of the sensorunits comprising at least one of a proximity sensor, an illuminationsensor, a fingerprint sensor, a near infrared chip, and an ultravioletchip.
 17. A display device, comprising: a first flexible printed circuitboard (FPCB) having a first surface and a second surface opposite thefirst surface; a plurality of light emitting elements disposed on thefirst surface of the first FPCB; a connector on the first surface of thefirst FPCB, the connector electrically connected to at least one of thelight emitting elements of the plurality; a second FPCB electricallyconnected to the first FPCB via the connector; a cover having a firstsurface and a second surface opposite the first surface, the firstsurface of the cover facing the first surface of the first FPCB, thecover at least partially surrounds the first FPCB; and a through holeextending between the first surface of the cover and the second surfaceof the cover.
 18. The display device according to claim 17, comprising:sensor units each disposed at the first surface of the first FPCBbetween adjacent ones of the light emitting elements, each of the sensorunits comprising at least one of a proximity sensor, an illuminationsensor, a fingerprint sensor, a near infrared chip, and an ultravioletchip.
 19. A display device, comprising: a first flexible printed circuitboard (FPCB) having a first surface and a second surface opposite thefirst surface; a plurality of light emitting elements disposed on thefirst surface of the first FPCB; a cover having a first surface and asecond surface opposite the first surface, the first surface of thecover facing the first surface of the first FPCB, the cover at leastpartially surrounds the first FPCB; a through hole extending between thefirst surface of the cover and the second surface of the cover; a secondFPCB electrically connected to the first FPCB and extending through thethrough hole; and sensor units each disposed at the same first surfaceof the first FPCB between adjacent ones of the light emitting elements.20. The display device according to claim 19, wherein each of the sensorunits comprises an ultraviolet (UV) chip emitting UV light forsterilization.